.user_item{
    overflow: hidden;
    padding: 20px 10px;
}

.popup{
    position: fixed;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    font-size: 0;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    text-align: center;
}
.popup::after{
    content: '';
    width: 0;
    height: 100%;
    display: inline-block;
    vertical-align: middle;
}
.popup_box{
    display: inline-block;
    width: 600px;
    height: 400px;
    text-align: center;
    vertical-align: middle;
    background-color: #fff;
    font-size: 16px;
}